Hyperextending hinge having fpc service loops for eyewear

ABSTRACT

Eyewear having a frame, a hinge, and a hyperextendable temple having a flexible printed circuit (FPC) including service loops. An extender is coupled to the hinge and the temple, and the extender extends with respect to the hinge allowing hyperextension of the temple with respect to the frame. A first service loop allows extension of the FPC when the temple rotates about the hinge, and a second service loop allows the temple to be radially extended away from the hinge.

TECHNICAL FIELD

The present subject matter relates to an eyewear device, e.g., smartglasses and see-through displays.

BACKGROUND

Portable eyewear devices, such as smart glasses, headwear, and headgearavailable today integrate cameras and see-through displays. Eyeweartypically include a frame and temples that can be extended into an openposition to allow placement about user's eyes.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawing figures depict one or more implementations, by way ofexample only, not by way of limitations. In the figures, like referencenumerals refer to the same or similar elements.

FIG. 1A is a side view of an example hardware configuration of aneyewear device, which shows a right optical assembly with an imagedisplay, and field of view adjustments are applied to a user interfacepresented on the image display based on detected head or eye movement bya user;

FIG. 1B is a top cross-sectional view of a temple of the eyewear deviceof FIG. 1A depicting a visible light camera, a head movement tracker fortracking the head movement of the user of the eyewear device, and acircuit board;

FIG. 2A is a rear view of an example hardware configuration of aneyewear device, which includes an eye scanner on a frame, for use in asystem for identifying a user of the eyewear device;

FIG. 2B is a rear view of an example hardware configuration of anothereyewear device, which includes an eye scanner on a temple, for use in asystem for identifying a user of the eyewear device;

FIGS. 2C and 2D are rear views of example hardware configurations of theeyewear device, including two different types of image displays.

FIG. 3 shows a rear perspective view of the eyewear device of FIG. 2Adepicting an infrared emitter, an infrared camera, a frame front, aframe back, and a circuit board;

FIG. 4 is a cross-sectional view taken through the infrared emitter andthe frame of the eyewear device of FIG. 3;

FIG. 5 illustrates detecting eye gaze direction;

FIG. 6 illustrates detecting eye position;

FIG. 7 depicts an example of visible light captured by the left visiblelight camera as a left raw image and visible light captured by the rightvisible light camera as a right raw image;

FIG. 8A illustrates a perspective view of an example hyperextendableeyewear hinge assembly;

FIG. 8B is a top view of the hinge assembly in the hyperextendedposition;

FIG. 8C illustrates a rear perspective view of the hyperextended hingeassembly;

FIG. 9A illustrates a top perspective view of the left temple foldedinwardly from fixed left temple;

FIG. 9B illustrates a bottom perspective view of the left temple foldedclosed with respect to the fixed left temple;

FIG. 10 illustrates a top sectional view of the left temple in the openposition with respect to the left temple;

FIG. 11 illustrates a top perspective view of the left temple in thehyperextended position, illustrating the bushing sliding along the pin;

FIG. 12 illustrates the left temple closed with respect to the lefttemple and illustrates the protrusion and the recess defined in the caphinge;

FIG. 13A is a top perspective view of pin positioned within the bushing;

FIG. 13B illustrates the pin shoulder at the distal end that securelyextends through an opening in the distal end of the bushing;

FIG. 13C illustrates a side sectional view illustrating the FPCextending within the left hinge;

FIG. 13D illustrates the first service loop formed over the bushing whenfirst temple is in the closed position;

FIG. 13E illustrates the hinge retracted against the bushing with thespring pushing on the shoulder to provide the retraction force;

FIG. 14A illustrates the left temple in the open position, wherein theprotrusion is seated in the recess;

FIG. 14B illustrates the hinge beginning to be hyperextended, theprotrusion sliding along the edge of the recess and being partiallywithdrawn from the recess and forming the cam and gap;

FIG. 14C illustrates the hinge fully hyperextended;

FIG. 15 illustrates an exploded view of the parts shown assembled in theprevious views; and

FIG. 16 illustrates a block diagram of electronic components of theeyewear device.

DETAILED DESCRIPTION

This disclosure is directed to eyewear having a frame, a hinge, and ahyperextendable temple having a flexible printed circuit (FPC) includingservice loops. An extender is coupled to the hinge and the temple, andthe extender extends with respect to the hinge allowing hyperextensionof the temple with respect to the frame. A first service loop allowsextension of the FPC when the temple rotates about the hinge, and asecond service loop allows the temple to be radially extended away fromthe hinge. The hinge is coupled to the frame, and a temple portioncoupled to, or forming a part of, the frame may be interposed betweenthe frame and the hinge. The extender may form a portion of the hinge.The extender may include a bushing and a spring that allows the templehyperextension.

Additional objects, advantages and novel features of the examples willbe set forth in part in the description which follows, and in part willbecome apparent to those skilled in the art upon examination of thefollowing and the accompanying drawings or may be learned by productionor operation of the examples. The objects and advantages of the presentsubject matter may be realized and attained by means of themethodologies, instrumentalities and combinations particularly pointedout in the appended claims.

In the following detailed description, numerous specific details are setforth by way of examples in order to provide a thorough understanding ofthe relevant teachings. However, it should be apparent to those skilledin the art that the present teachings may be practiced without suchdetails. In other instances, well known methods, procedures, components,and circuitry have been described at a relatively high-level, withoutdetail, in order to avoid unnecessarily obscuring aspects of the presentteachings.

The term “coupled” as used herein refers to any logical, optical,physical or electrical connection, link or the like by which signals orlight produced or supplied by one system element are imparted to anothercoupled element. Unless described otherwise, coupled elements or devicesare not necessarily directly connected to one another and may beseparated by intermediate components, elements or communication mediathat may modify, manipulate or carry the light or signals.

The orientations of the eyewear device, associated components and anycomplete devices incorporating an eye scanner and camera such as shownin any of the drawings, are given by way of example only, forillustration and discussion purposes. In operation for a particularvariable optical processing application, the eyewear device may beoriented in any other direction suitable to the particular applicationof the eyewear device, for example up, down, sideways, or any otherorientation. Also, to the extent used herein, any directional term, suchas front, rear, inwards, outwards, towards, left, right, lateral,longitudinal, up, down, upper, lower, top, bottom and side, are used byway of example only, and are not limiting as to direction or orientationof any optic or component of an optic constructed as otherwise describedherein.

Reference now is made in detail to the examples illustrated in theaccompanying drawings and discussed below.

FIG. 1A is a side view of an example hardware configuration of aneyewear device 100, which includes a right optical assembly 180B with animage display 180D (FIG. 2A). Eyewear device 100 includes multiplevisible light cameras 114A-B (FIG. 7) that form a stereo camera, ofwhich the right visible light camera 114B is located on a right temple110B.

The left and right visible light cameras 114A-B have an image sensorthat is sensitive to the visible light range wavelength. Each of thevisible light cameras 114A-B have a different frontward facing angle ofcoverage, for example, visible light camera 114B has the depicted angleof coverage 111B. The angle of coverage is an angle range which theimage sensor of the visible light camera 114A-B picks up electromagneticradiation and generates images. Examples of such visible lights camera114A-B include a high-resolution complementary metal-oxide-semiconductor(CMOS) image sensor and a video graphic array (VGA) camera, such as 640p(e.g., 640×480 pixels for a total of 0.3 megapixels), 720p, or 1080p.Image sensor data from the visible light cameras 114A-B are capturedalong with geolocation data, digitized by an image processor, and storedin a memory.

To provide stereoscopic vision, visible light cameras 114A-B may becoupled to an image processor (element 912 of FIG. 9) for digitalprocessing along with a timestamp in which the image of the scene iscaptured. Image processor 912 includes circuitry to receive signals fromthe visible light camera 114A-B and process those signals from thevisible light cameras 114A-B into a format suitable for storage in thememory (element 934 of FIG. 9). The timestamp can be added by the imageprocessor 912 or other processor, which controls operation of thevisible light cameras 114A-B. Visible light cameras 114A-B allow thestereo camera to simulate human binocular vision. Stereo cameras providethe ability to reproduce three-dimensional images (element 715 of FIG.7) based on two captured images (elements 758A-B of FIG. 7) from thevisible light cameras 114A-B, respectively, having the same timestamp.Such three-dimensional images 715 allow for an immersive life-likeexperience, e.g., for virtual reality or video gaming. For stereoscopicvision, the pair of images 758A-B are generated at a given moment intime—one image for each of the left and right visible light cameras114A-B. When the pair of generated images 758A-B from the frontwardfacing angles of coverage 111A-B of the left and right visible lightcameras 114A-B are stitched together (e.g., by the image processor 912),depth perception is provided by the optical assembly 180A-B.

In an example, a user interface field of view adjustment system includesthe eyewear device 100. The eyewear device 100 includes a frame 105, aright temple 110B extending from a right lateral side 170B of the frame105, and a see-through image display 180D (FIGS. 2A-B) comprisingoptical assembly 180B to present a graphical user interface to a user.The eyewear device 100 includes the left visible light camera 114Aconnected to the frame 105 or the left temple 110A to capture a firstimage of the scene. Eyewear device 100 further includes the rightvisible light camera 114B connected to the frame 105 or the right temple110B to capture (e.g., simultaneously with the left visible light camera114A) a second image of the scene which partially overlaps the firstimage. Although not shown in FIGS. 1A-B, the user interface field ofview adjustment system further includes the processor 932 coupled to theeyewear device 100 and connected to the visible light cameras 114A-B,the memory 934 accessible to the processor 932, and programming in thememory 934, for example in the eyewear device 100 itself or another partof the user interface field of view adjustment system.

Although not shown in FIG. 1A, the eyewear device 100 also includes ahead movement tracker (element 109 of FIG. 1B) or an eye movementtracker (element 213 of FIGS. 2A-B). Eyewear device 100 further includesthe see-through image displays 180C-D of optical assembly 180A-B forpresenting a sequence of displayed images, and an image display driver(element 942 of FIG. 9) coupled to the see-through image displays 180C-Dof optical assembly 180A-B to control the image displays 180C-D ofoptical assembly 180A-B to present the sequence of displayed images 715,which are described in further detail below. Eyewear device 100 furtherincludes the memory 934 and the processor 932 having access to the imagedisplay driver 942 and the memory 934. Eyewear device 100 furtherincludes programming (element 934 of FIG. 9) in the memory. Execution ofthe programming by the processor 932 configures the eyewear device 100to perform functions, including functions to present, via thesee-through image displays 180C-D, an initial displayed image of thesequence of displayed images, the initial displayed image having aninitial field of view corresponding to an initial head direction or aninitial eye gaze direction (element 230 of FIG. 5).

Execution of the programming by the processor 932 further configures theeyewear device 100 to detect movement of a user of the eyewear deviceby: (i) tracking, via the head movement tracker (element 109 of FIG.1B), a head movement of a head of the user, or (ii) tracking, via an eyemovement tracker (element 113, 213 of FIGS. 2A-B, FIG. 5), an eyemovement of an eye of the user of the eyewear device 100. Execution ofthe programming by the processor 932 further configures the eyeweardevice 100 to determine a field of view adjustment to the initial fieldof view of the initial displayed image based on the detected movement ofthe user. The field of view adjustment includes a successive field ofview corresponding to a successive head direction or a successive eyedirection. Execution of the programming by the processor 932 furtherconfigures the eyewear device 100 to generate a successive displayedimage of the sequence of displayed images based on the field of viewadjustment. Execution of the programming by the processor 932 furtherconfigures the eyewear device 100 to present, via the see-through imagedisplays 180C-D of the optical assembly 180A-B, the successive displayedimages.

FIG. 1B is a top cross-sectional view of the temple of the eyeweardevice 100 of FIG. 1A depicting the right visible light camera 114B, ahead movement tracker 109, and a circuit board. Construction andplacement of the left visible light camera 114A is substantially similarto the right visible light camera 114B, except the connections andcoupling are on the left lateral side 170A. As shown, the eyewear device100 includes the right visible light camera 114B and a circuit board,which may be a flexible printed circuit board (PCB) 140. The right hinge226B connects the right temple 110B to a right temple 125B of theeyewear device 100. In some examples, components of the right visiblelight camera 114B, the flexible PCB 140, or other electrical connectorsor contacts may be located on the right temple 125B or the right hinge226B.

As shown, eyewear device 100 has a head movement tracker 109, whichincludes, for example, an inertial measurement unit (IMU). An inertialmeasurement unit is an electronic device that measures and reports abody's specific force, angular rate, and sometimes the magnetic fieldsurrounding the body, using a combination of accelerometers andgyroscopes, sometimes also magnetometers. The inertial measurement unitworks by detecting linear acceleration using one or more accelerometersand rotational rate using one or more gyroscopes. Typical configurationsof inertial measurement units contain one accelerometer, gyro, andmagnetometer per axis for each of the three axes: horizontal axis forleft-right movement (X), vertical axis (Y) for top-bottom movement, anddepth or distance axis for up-down movement (Z). The accelerometerdetects the gravity vector. The magnetometer defines the rotation in themagnetic field (e.g., facing south, north, etc.) like a compass whichgenerates a heading reference. The three accelerometers to detectacceleration along the horizontal, vertical, and depth axis definedabove, which can be defined relative to the ground, the eyewear device100, or the user wearing the eyewear device 100.

Eyewear device 100 detects movement of the user of the eyewear device100 by tracking, via the head movement tracker 109, the head movement ofthe head of the user. The head movement includes a variation of headdirection on a horizontal axis, a vertical axis, or a combinationthereof from the initial head direction during presentation of theinitial displayed image on the image display. In one example, tracking,via the head movement tracker 109, the head movement of the head of theuser includes measuring, via the inertial measurement unit 109, theinitial head direction on the horizontal axis (e.g., X axis), thevertical axis (e.g., Y axis), or the combination thereof (e.g.,transverse or diagonal movement). Tracking, via the head movementtracker 109, the head movement of the head of the user further includesmeasuring, via the inertial measurement unit 109, a successive headdirection on the horizontal axis, the vertical axis, or the combinationthereof during presentation of the initial displayed image.

Tracking, via the head movement tracker 109, the head movement of thehead of the user further includes determining the variation of headdirection based on both the initial head direction and the successivehead direction. Detecting movement of the user of the eyewear device 100further includes in response to tracking, via the head movement tracker109, the head movement of the head of the user, determining that thevariation of head direction exceeds a deviation angle threshold on thehorizontal axis, the vertical axis, or the combination thereof. Thedeviation angle threshold is between about 3° to 10°. As used herein,the term “about” when referring to an angle means±10% from the statedamount.

Variation along the horizontal axis slides three-dimensional objects,such as characters, bitmojis, application icons, etc. in and out of thefield of view by, for example, hiding, unhiding, or otherwise adjustingvisibility of the three-dimensional object. Variation along the verticalaxis, for example, when the user looks upwards, in one example, displaysweather information, time of day, date, calendar appointments, etc. Inanother example, when the user looks downwards on the vertical axis, theeyewear device 100 may power down.

The right temple 110B includes temple body 211 and a temple cap, withthe temple cap omitted in the cross-section of FIG. 1B. Disposed insidethe right temple 110B are various interconnected circuit boards, such asPCBs or flexible PCBs, that include controller circuits for rightvisible light camera 114B, microphone(s) 130, speaker(s) 132, low-powerwireless circuitry (e.g., for wireless short-range network communicationvia Bluetooth™), high-speed wireless circuitry (e.g., for wireless localarea network communication via WiFi).

The right visible light camera 114B is coupled to or disposed on theflexible PCB 240 and covered by a visible light camera cover lens, whichis aimed through opening(s) formed in the right temple 110B. In someexamples, the frame 105 connected to the right temple 110B includes theopening(s) for the visible light camera cover lens. The frame 105includes a front-facing side configured to face outwards away from theeye of the user. The opening for the visible light camera cover lens isformed on and through the front-facing side. In the example, the rightvisible light camera 114B has an outwards facing angle of coverage 111Bwith a line of sight or perspective of the right eye of the user of theeyewear device 100. The visible light camera cover lens can also beadhered to an outwards facing surface of the right temple 110B in whichan opening is formed with an outwards facing angle of coverage, but in adifferent outwards direction. The coupling can also be indirect viaintervening components.

Left (first) visible light camera 114A is connected to the leftsee-through image display 180C of left optical assembly 180A to generatea first background scene of a first successive displayed image. Theright (second) visible light camera 114B is connected to the rightsee-through image display 180D of right optical assembly 180B togenerate a second background scene of a second successive displayedimage. The first background scene and the second background scenepartially overlap to present a three-dimensional observable area of thesuccessive displayed image.

Flexible PCB 140 is disposed inside the right temple 110B and is coupledto one or more other components housed in the right temple 110B.Although shown as being formed on the circuit boards of the right temple110B, the right visible light camera 114B can be formed on the circuitboards of the left temple 110A, the temples 125A-B, or frame 105.

FIG. 2A is a rear view of an example hardware configuration of aneyewear device 100, which includes an eye scanner 113 on a frame 105,for use in a system for determining an eye position and gaze directionof a wearer/user of the eyewear device 100. As shown in FIG. 2A, theeyewear device 100 is in a form configured for wearing by a user, whichare eyeglasses in the example of FIG. 2A. The eyewear device 100 cantake other forms and may incorporate other types of frameworks, forexample, a headgear, a headset, or a helmet.

In the eyeglasses example, eyewear device 100 includes the frame 105which includes the left rim 107A connected to the right rim 107B via thebridge 106 adapted for a nose of the user. The left and right rims107A-B include respective apertures 175A-B which hold the respectiveoptical element 180A-B, such as a lens and the see-through displays180C-D. As used herein, the term lens is meant to cover transparent ortranslucent pieces of glass or plastic having curved and flat surfacesthat cause light to converge/diverge or that cause little or noconvergence/divergence.

Although shown as having two optical elements 180A-B, the eyewear device100 can include other arrangements, such as a single optical elementdepending on the application or intended user of the eyewear device 100.As further shown, eyewear device 100 includes the left temple 110Aadjacent the left lateral side 170A of the frame 105 and the righttemple 110B adjacent the right lateral side 170B of the frame 105. Thetemples 110A-B may be integrated into the frame 105 on the respectivesides 170A-B (as illustrated) or implemented as separate componentsattached to the frame 105 on the respective sides 170A-B. Alternatively,the temples 110A-B may be integrated into temples (not shown) attachedto the frame 105.

In the example of FIG. 2A, the eye scanner 113 includes an infraredemitter 115 and an infrared camera 120. Visible light cameras typicallyinclude a blue light filter to block infrared light detection, in anexample, the infrared camera 120 is a visible light camera, such as alow-resolution video graphic array (VGA) camera (e.g., 640×480 pixelsfor a total of 0.3 megapixels), with the blue filter removed. Theinfrared emitter 115 and the infrared camera 120 are co-located on theframe 105, for example, both are shown as connected to the upper portionof the left rim 107A. The frame 105 or one or more of the left and righttemples 110A-B include a circuit board (not shown) that includes theinfrared emitter 115 and the infrared camera 120. The infrared emitter115 and the infrared camera 120 can be connected to the circuit board bysoldering, for example.

Other arrangements of the infrared emitter 115 and infrared camera 120can be implemented, including arrangements in which the infrared emitter115 and infrared camera 120 are both on the right rim 107B, or indifferent locations on the frame 105, for example, the infrared emitter115 is on the left rim 107A and the infrared camera 120 is on the rightrim 107B. In another example, the infrared emitter 115 is on the frame105 and the infrared camera 120 is on one of the temples 110A-B, or viceversa. The infrared emitter 115 can be connected essentially anywhere onthe frame 105, left temple 110A, or right temple 110B to emit a patternof infrared light. Similarly, the infrared camera 120 can be connectedessentially anywhere on the frame 105, left temple 110A, or right temple110B to capture at least one reflection variation in the emitted patternof infrared light.

The infrared emitter 115 and infrared camera 120 are arranged to faceinwards towards an eye of the user with a partial or full field of viewof the eye in order to identify the respective eye position and gazedirection. For example, the infrared emitter 115 and infrared camera 120are positioned directly in front of the eye, in the upper part of theframe 105 or in the temples 110A-B at either ends of the frame 105.

FIG. 2B is a rear view of an example hardware configuration of anothereyewear device 200. In this example configuration, the eyewear device200 is depicted as including an eye scanner 213 on a right temple 210B.As shown, an infrared emitter 215 and an infrared camera 220 areco-located on the right temple 210B. It should be understood that theeye scanner 213 or one or more components of the eye scanner 213 can belocated on the left temple 210A and other locations of the eyeweardevice 200, for example, the frame 205. The infrared emitter 215 andinfrared camera 220 are like that of FIG. 2A, but the eye scanner 213can be varied to be sensitive to different light wavelengths asdescribed previously in FIG. 2A.

Similar to FIG. 2A, the eyewear device 200 includes a frame 105 whichincludes a left rim 107A which is connected to a right rim 107B via abridge 106; and the left and right rims 107A-B include respectiveapertures which hold the respective optical elements 180A-B comprisingthe see-through display 180C-D.

FIGS. 2C-D are rear views of example hardware configurations of theeyewear device 100, including two different types of see-through imagedisplays 180C-D. In one example, these see-through image displays 180C-Dof optical assembly 180A-B include an integrated image display. As shownin FIG. 2C, the optical assemblies 180A-B includes a suitable displaymatrix 180C-D of any suitable type, such as a liquid crystal display(LCD), an organic light-emitting diode (OLED) display, a waveguidedisplay, or any other such display. The optical assembly 180A-B alsoincludes an optical layer or layers 176, which can include lenses,optical coatings, prisms, mirrors, waveguides, optical strips, and otheroptical components in any combination. The optical layers 176A-N caninclude a prism having a suitable size and configuration and including afirst surface for receiving light from display matrix and a secondsurface for emitting light to the eye of the user. The prism of theoptical layers 176A-N extends over all or at least a portion of therespective apertures 175A-B formed in the left and right rims 107A-B topermit the user to see the second surface of the prism when the eye ofthe user is viewing through the corresponding left and right rims107A-B. The first surface of the prism of the optical layers 176A-Nfaces upwardly from the frame 105 and the display matrix overlies theprism so that photons and light emitted by the display matrix impingethe first surface. The prism is sized and shaped so that the light isrefracted within the prism and is directed towards the eye of the userby the second surface of the prism of the optical layers 176A-N. In thisregard, the second surface of the prism of the optical layers 176A-N canbe convex to direct the light towards the center of the eye. The prismcan optionally be sized and shaped to magnify the image projected by thesee-through image displays 180C-D, and the light travels through theprism so that the image viewed from the second surface is larger in oneor more dimensions than the image emitted from the see-through imagedisplays 180C-D.

In another example, the see-through image displays 180C-D of opticalassembly 180A-B include a projection image display as shown in FIG. 2D.The optical assembly 180A-B includes a laser projector 150, which is athree-color laser projector using a scanning mirror or galvanometer.During operation, an optical source such as a laser projector 150 isdisposed in or on one of the temples 125A-B of the eyewear device 100.Optical assembly 180-B includes one or more optical strips 155A-N spacedapart across the width of the lens of the optical assembly 180A-B oracross a depth of the lens between the front surface and the rearsurface of the lens.

As the photons projected by the laser projector 150 travel across thelens of the optical assembly 180A-B, the photons encounter the opticalstrips 155A-N. When a particular photon encounters a particular opticalstrip, the photon is either redirected towards the user's eye, or itpasses to the next optical strip. A combination of modulation of laserprojector 150, and modulation of optical strips, may control specificphotons or beams of light. In an example, a processor controls opticalstrips 155A-N by initiating mechanical, acoustic, or electromagneticsignals. Although shown as having two optical assemblies 180A-B, theeyewear device 100 can include other arrangements, such as a single orthree optical assemblies, or the optical assembly 180A-B may havearranged different arrangement depending on the application or intendeduser of the eyewear device 100.

As further shown in FIGS. 2C-D, eyewear device 100 includes a lefttemple 110A adjacent the left lateral side 170A of the frame 105 and aright temple 110B adjacent the right lateral side 170B of the frame 105.The temples 110A-B may be integrated into the frame 105 on therespective lateral sides 170A-B (as illustrated) or implemented asseparate components attached to the frame 105 on the respective sides170A-B. Alternatively, the temples 110A-B may be integrated into temples125A-B attached to the frame 105.

In one example, the see-through image displays include the firstsee-through image display 180C and the second see-through image display180D. Eyewear device 100 includes first and second apertures 175A-Bwhich hold the respective first and second optical assembly 180A-B. Thefirst optical assembly 180A includes the first see-through image display180C (e.g., a display matrix of FIG. 2C or optical strips 155A-N′ and aprojector 150A). The second optical assembly 180B includes the secondsee-through image display 180D e.g., a display matrix of FIG. 2C oroptical strips 155A-N″ and a projector 150B). The successive field ofview of the successive displayed image includes an angle of view betweenabout 15° to 30, and more specifically 24°, measured horizontally,vertically, or diagonally. The successive displayed image having thesuccessive field of view represents a combined three-dimensionalobservable area visible through stitching together of two displayedimages presented on the first and second image displays.

As used herein, “an angle of view” describes the angular extent of thefield of view associated with the displayed images presented on each ofthe left and right image displays 180C-D of optical assembly 180A-B. The“angle of coverage” describes the angle range that a lens of visiblelight cameras 114A-B or infrared camera 220 can image. Typically, theimage circle produced by a lens is large enough to cover the film orsensor completely, possibly including some vignetting (i.e., a reductionof an image's brightness or saturation toward the periphery compared tothe image center). If the angle of coverage of the lens does not fillthe sensor, the image circle will be visible, typically with strongvignetting toward the edge, and the effective angle of view will belimited to the angle of coverage. The “field of view” is intended todescribe the field of observable area which the user of the eyeweardevice 100 can see through his or her eyes via the displayed imagespresented on the left and right image displays 180C-D of the opticalassembly 180A-B. Image display 180C of optical assembly 180A-B can havea field of view with an angle of coverage between 15° to 30°, forexample 24°, and have a resolution of 480×480 pixels.

FIG. 3 shows a rear perspective view of the eyewear device of FIG. 2A.The eyewear device 100 includes an infrared emitter 215, infrared camera220, a frame front 330, a frame back 335, and a circuit board 340. Itcan be seen in FIG. 3 that the upper portion of the left rim of theframe of the eyewear device 100 includes the frame front 330 and theframe back 335. An opening for the infrared emitter 215 is formed on theframe back 335.

As shown in the encircled cross-section 4-4 in the upper middle portionof the left rim of the frame, a circuit board, which is a flexible PCB340, is sandwiched between the frame front 330 and the frame back 335.Also shown in further detail is the attachment of the left temple 110Ato the left temple 325A via the left hinge 326A. In some examples,components of the eye movement tracker 213, including the infraredemitter 215, the flexible PCB 340, or other electrical connectors orcontacts may be located on the left temple 325A or the left hinge 326A.

FIG. 4 is a cross-sectional view through the infrared emitter 215 andthe frame corresponding to the encircled cross-section 4-4 of theeyewear device of FIG. 3. Multiple layers of the eyewear device 100 areillustrated in the cross-section of FIG. 4, as shown the frame includesthe frame front 330 and the frame back 335. The flexible PCB 340 isdisposed on the frame front 330 and connected to the frame back 335. Theinfrared emitter 215 is disposed on the flexible PCB 340 and covered byan infrared emitter cover lens 445. For example, the infrared emitter215 is reflowed to the back of the flexible PCB 340. Reflowing attachesthe infrared emitter 215 to contact pad(s) formed on the back of theflexible PCB 340 by subjecting the flexible PCB 340 to controlled heatwhich melts a solder paste to connect the two components. In oneexample, reflowing is used to surface mount the infrared emitter 215 onthe flexible PCB 340 and electrically connect the two components.However, it should be understood that through-holes can be used toconnect leads from the infrared emitter 215 to the flexible PCB 340 viainterconnects, for example.

The frame back 335 includes an infrared emitter opening 450 for theinfrared emitter cover lens 445. The infrared emitter opening 450 isformed on a rear-facing side of the frame back 335 that is configured toface inwards towards the eye of the user. In the example, the flexiblePCB 340 can be connected to the frame front 330 via the flexible PCBadhesive 460. The infrared emitter cover lens 445 can be connected tothe frame back 335 via infrared emitter cover lens adhesive 455. Thecoupling can also be indirect via intervening components.

In an example, the processor 932 utilizes eye tracker 213 to determinean eye gaze direction 230 of a wearer's eye 234 as shown in FIG. 5, andan eye position 236 of the wearer's eye 234 within an eyebox as shown inFIG. 6. The eye tracker 213 is a scanner which uses infrared lightillumination (e.g., near-infrared, short-wavelength infrared,mid-wavelength infrared, long-wavelength infrared, or far infrared) tocaptured image of reflection variations of infrared light from the eye234 to determine the gaze direction 230 of a pupil 232 of the eye 234,and also the eye position 236 with respect to the see-through display180D.

FIG. 7 depicts an example of capturing visible light with cameras.Visible light is captured by the left visible light camera 114A with aleft visible light camera field of view 111A as a left raw image 758A.Visible light is captured by the right visible light camera 114B with aright visible light camera field of view 111B as a right raw image 758B.Based on processing of the left raw image 758A and the right raw image758B, a three-dimensional depth map 715 of a three-dimensional scene,referred to hereafter as an image, is generated by processor 932.

FIG. 8A illustrates a perspective view of an example hyperextendableeyewear hinge assembly 1000 comprising a hinge 1001 rotatably secured ina cap hinge 1006 and configured to allow rotation of the left temple125A with respect to fixed left temple 110A. The left temple 110A canform a portion of the frame 105 as shown, and the left temple 110A canalso be regarded as a frame extension. The cap hinge 1006 is secured tothe distal end of the left temple 110A by a screw boss 1009 as shown inFIG. 11. An elongated pin 1010 is secured to, and radially extends from,hinge 1001. The elongated pin 1010 is dual purpose, and is configured toallow hyperextended outward rotation of left temple 125A with respect toleft temple 110A, as shown in FIG. 8A, FIG. 8B, and FIG. 8C. Theelongated pin 1010 is also configured to allow linear extension of theleft temple 125A along the elongated pin 1010 and in an axial directionfrom the hinge 1001. This hinge assembly 1000 can also be providedbetween right temple 110B and right temple 125B.

FIG. 8B is a top view of the hinge assembly 1000 in the hyperextendedposition. An outwardly extending protrusion 1002 is positioned on aflange of the cap hinge 1006, and the protrusion 1002 faces a recess1004 formed in a cosmetic trim 1008 that is secured to a proximal end ofleft temple 125A. The protrusion 1002 extends laterally and functions asa cam when the left temple 125A is hyperextended such that theprotrusion 1002 leverages off the cosmetic trim 1008 and create a gap1007 between the sharp corner edges of the temples which would otherwisewear, as also shown in FIG. 12

FIG. 8C illustrates a rear perspective view of the hyperextended hingeassembly 1000. As shown, the hinge 1001 is positioned in the cap hinge1006. The feature will be further discussed in reference to FIG. 14A-C.

FIG. 9A illustrates a top perspective view of the left temple 125Afolded inwardly from fixed left temple 110A. The proximal end of thecosmetic trim 1008 facing the cap hinge 1006 includes the elongatedrecess 1004. The recess 1004 is commensurate in shape and size with theprotrusion 1002, and which receives the protrusion 1002 when the lefttemple 125 is in the open (not hyperextended) position. As the hinge1001 is rotated outwardly from the open position to the hyperextendedposition as shown in FIG. 8B, the protrusion 1002 laterally slides outof the recess 1004 and functions as the cam to create leverage and tocreate gap 1007 as previously discussed. In another example, theprotrusion 1002 and recess 1004 can have other shapes, such as a simpleround protrusion forming a dimple, and a round recess, and limitation tothe particular shape of each is not to be inferred. The elongatedprotrusion 1002 and elongated recess 1004 are preferred shapes as theybetter align the left temple 125A to the left temple 110A to securelyrotate outwardly, such as at a 90-degree angle.

FIG. 9B illustrates a bottom perspective view of the left temple 125Afolded closed with respect to the fixed left temple 110A. It is noted aflexible printed circuit (FPC) is encased in the hinge 1001 and notviewable, as will be discussed further shortly.

FIG. 10 illustrates a top sectional view of the left temple 125A in theopen position with respect to the left temple 110A. As shown, theprotrusion 1002 is seated in the recess 1004. FIG. 10 illustrates theelongated pin 1010 securely coupled to the hinge 1001 at a proximal end,and extending longitudinally within the left temple 125A. The pin 1010is positioned within and encompassed by a spring 1012, which spring 1012is secured within a rectangular bushing 1014. The sliding pin has ashoulder 1016 at the distal end which is positioned outside the bushing1014. The shoulder 1016 limits the travel of the bushing 1014 along thesliding pin 1010 when the left temple 125A is fully hyperextended, asshown in FIG. 11. A FPC 1022 is shown extending within the left temple125A and under a guide member 1024, and has a pair of strain reliefloops to assist in hyperextending, and closing the left temple 125A aswill be discussed shortly.

FIG. 11 illustrates a top perspective view of the left temple 125A inthe hyperextended position, illustrating the bushing 1014 sliding alongthe pin 1010 and extending to the distal end of the pin 1010 andengaging the shoulder 1016 which limits travel of the bushing 1014. Thiscreates a gap 1017 between the hinge 1001 and the bushing 1014. In thisposition, the spring 1012 is fully compressed which creates a slightbias force to help the left temple 125A to compress against a user'shead in comfort and keep the eyewear on the user. The hinge 1001 has aflange 1003 having a narrowed web 1005 that is configured to function asa soft radius for the FPC 1022 to bend around. While flange 1003 can bedesigned to provide a rotation hardstop, the hardstop functionality forhyperextension of the temple is provided by the shoulder 1016 on the pin1010. A fastener 1020 is positioned in a friction clip 1032 and extendswithin the hinge 1001 to secure left temple 125A to left temple 110A.

FIG. 12 illustrates the left temple 125A closed with respect to the lefttemple 110A and illustrates the protrusion 1002 and the recess 1004defined in the cap hinge 1006 as previously described.

FIG. 13A is a top perspective view of pin 1010 positioned within thebushing 1014. The pin 1010 has a rectangular shoulder 1018 at the distalend that securely extends through an opening 1021 in the distal end ofthe bushing 1014 as shown in FIG. 13B. The shoulder 1018 has the samesize and shape of the bushing opening 1021. The shoulder 1018 engagesthe distal end of the spring 1012 to retain and compress the spring 1012within the bushing 1014 in the hyperextended position. The shoulder 1018also functions to reduce the amount of rotation of the shaft on itscenter axis. By making shoulder 1018 wider than the rest of the pin1010, the shoulder 1018 contacts the bushing 1014 at a smaller angle. Afastener 1030 secures the proximal end of the pin 1010 to the hinge1001. The hinge 1001 is rotatably positioned in the cap hinge 1006.

FIG. 13C illustrates a side sectional view illustrating the FPC 1022extending within the left temple 125A, as previously described withrespect to FIG. 10. The left temple 125A has the guide member 1024 (FIG.10) forming a first channel 1027 receiving the FPC 1022, and forming afirst service loop 1026 for FPC 1022. The first service loop 1026 formsa strain relief that straightens out the FPC 1022 when the bushing 1014slides outwardly in the hyperextended position, as discussed withrespect to FIG. 11. The hinge 1001 has a second channel 1028 formedtherein receiving the FPC 1022 and forming a second service loop 1034for when the hinge rotates from the closed position to the open positionand the hyperextended position and the bushing 1014 extends along pin1010. The first service loop 1026 and the second service loop 1034 arespaced apart from each other by the hinge 1001, and they are positionedon opposite sides of the second channel 1028.

FIG. 13D illustrates the first service loop 1026 formed over the bushing1014 when first temple 125A is in the closed position. This firstservice loop 1026 straightens out when the bushing 1014 extends alongthe length of the pin 1010, and the FPC 1022 slides within the firstchannel 1027.

FIG. 13E illustrates the hinge 1001 retracted against the bushing 1014with the spring 1012 pushing on the shoulder 1016 to provide theretraction force.

Referring to FIG. 14A, FIG. 14B, and FIG. 14C, there is shown theprogression of the protrusion 1002 sliding out the recess 1004 of caphinge 1006 and forming a cam as the hinge 1001 is hyperextended, aspreviously described with respect to FIG. 8B.

FIG. 14A illustrates the left temple 125A in the open position, whereinthe protrusion 1002 is seated in the recess 1004. As the hinge 1000begins to be hyperextended, as shown in FIG. 14B, the protrusion 1002slides along the edge of the recess 1004 and becomes partially withdrawnfrom the recess 1004 and forms the cam, and gap 1007. The bushing 1014is partially slid along the pin 1010. As shown in FIG. 14C, the hinge1000 is fully hyperextended, and the protrusion 1002 is fully withdrawnfrom the recess 1004. Here, the bushing 1014 is fully extended along thepin 1010 and engages against the shoulder 1018, as shown in FIG. 11. Theprotrusion 1002 and the recess 1004 are both elongated to guide the lefttemple 125A to the hyperextended position in a predetermined direction,such as 110 degrees with respect to the left temple 110A.

FIG. 15 illustrates an exploded view of the parts shown assembled in theprevious views. A piece of foam tape 1028 may be used to help hold theFPC 1022 inside the hinge 1000, and it is optional.

FIG. 16 depicts a high-level functional block diagram including exampleelectronic components disposed in eyewear 100 and 200. The illustratedelectronic components include the processor 932, the memory 934, and thesee-through image display 180C and 180D.

Memory 934 includes instructions for execution by processor 932 toimplement functionality of eyewear 100/200, including instructions forprocessor 932 to control in the image 715. Processor 932 receives powerfrom battery (not shown) and executes the instructions stored in memory934, or integrated with the processor 932 on-chip, to performfunctionality of eyewear 100/200, and communicating with externaldevices via wireless connections.

A user interface adjustment system 900 includes a wearable device, whichis the eyewear device 100 with an eye movement tracker 213 (e.g., shownas infrared emitter 215 and infrared camera 220 in FIG. 2B). Userinterface adjustments system 900 also includes a mobile device 990 and aserver system 998 connected via various networks. Mobile device 990 maybe a smartphone, tablet, laptop computer, access point, or any othersuch device capable of connecting with eyewear device 100 using both alow-power wireless connection 925 and a high-speed wireless connection937. Mobile device 990 is connected to server system 998 and network995. The network 995 may include any combination of wired and wirelessconnections.

Eyewear device 100 includes at least two visible light cameras 114A-B(one associated with the left lateral side 170A and one associated withthe right lateral side 170B). Eyewear device 100 further includes twosee-through image displays 180C-D of the optical assembly 180A-B (oneassociated with the left lateral side 170A and one associated with theright lateral side 170B). Eyewear device 100 also includes image displaydriver 942, image processor 912, low-power circuitry 920, and high-speedcircuitry 930. The components shown in FIG. 9 for the eyewear device 100are located on one or more circuit boards, for example a PCB or flexiblePCB, in the temples. Alternatively, or additionally, the depictedcomponents can be located in the temples, frames, hinges, or bridge ofthe eyewear device 100. Left and right visible light cameras 114A-B caninclude digital camera elements such as a complementarymetal-oxide-semiconductor (CMOS) image sensor, charge coupled device, alens, or any other respective visible or light capturing elements thatmay be used to capture data, including images of scenes with unknownobjects.

Eye movement tracking programming 945 implements the user interfacefield of view adjustment instructions, including, to cause the eyeweardevice 100 to track, via the eye movement tracker 213, the eye movementof the eye of the user of the eyewear device 100. Other implementedinstructions (functions) cause the eyewear device 100 to determine, afield of view adjustment to the initial field of view of an initialdisplayed image based on the detected eye movement of the usercorresponding to a successive eye direction. Further implementedinstructions generate a successive displayed image of the sequence ofdisplayed images based on the field of view adjustment. The successivedisplayed image is produced as visible output to the user via the userinterface. This visible output appears on the see-through image displays180C-D of optical assembly 180A-B, which is driven by image displaydriver 934 to present the sequence of displayed images, including theinitial displayed image with the initial field of view and thesuccessive displayed image with the successive field of view.

As shown in FIG. 16, high-speed circuitry 930 includes high-speedprocessor 932, memory 934, and high-speed wireless circuitry 936. In theexample, the image display driver 942 is coupled to the high-speedcircuitry 930 and operated by the high-speed processor 932 in order todrive the left and right image displays 180C-D of the optical assembly180A-B. High-speed processor 932 may be any processor capable ofmanaging high-speed communications and operation of any generalcomputing system needed for eyewear device 100. High-speed processor 932includes processing resources needed for managing high-speed datatransfers on high-speed wireless connection 937 to a wireless local areanetwork (WLAN) using high-speed wireless circuitry 936. In certainexamples, the high-speed processor 932 executes an operating system suchas a LINUX operating system or other such operating system of theeyewear device 100 and the operating system is stored in memory 934 forexecution. In addition to any other responsibilities, the high-speedprocessor 932 executing a software architecture for the eyewear device100 is used to manage data transfers with high-speed wireless circuitry936. In certain examples, high-speed wireless circuitry 936 isconfigured to implement Institute of Electrical and Electronic Engineers(IEEE) 802.11 communication standards, also referred to herein as Wi-Fi.In other examples, other high-speed communications standards may beimplemented by high-speed wireless circuitry 936.

Low-power wireless circuitry 924 and the high-speed wireless circuitry936 of the eyewear device 100 can include short range transceivers(Bluetooth™) and wireless wide, local, or wide area network transceivers(e.g., cellular or WiFi). Mobile device 990, including the transceiverscommunicating via the low-power wireless connection 925 and high-speedwireless connection 937, may be implemented using details of thearchitecture of the eyewear device 100, as can other elements of network995.

Memory 934 includes any storage device capable of storing various dataand applications, including, among other things, color maps, camera datagenerated by the left and right visible light cameras 114A-B and theimage processor 912, as well as images generated for display by theimage display driver 942 on the see-through image displays 180C-D of theoptical assembly 180A-B. While memory 934 is shown as integrated withhigh-speed circuitry 930, in other examples, memory 934 may be anindependent standalone element of the eyewear device 100. In certainsuch examples, electrical routing lines may provide a connection througha chip that includes the high-speed processor 932 from the imageprocessor 912 or low-power processor 922 to the memory 934. In otherexamples, the high-speed processor 932 may manage addressing of memory934 such that the low-power processor 922 will boot the high-speedprocessor 932 any time that a read or write operation involving memory934 is needed.

Server system 998 may be one or more computing devices as part of aservice or network computing system, for example, that include aprocessor, a memory, and network communication interface to communicateover the network 995 with the mobile device 990 and eyewear device 100.Eyewear device 100 is connected with a host computer. For example, theeyewear device 100 is paired with the mobile device 990 via thehigh-speed wireless connection 937 or connected to the server system 998via the network 995.

Output components of the eyewear device 100 include visual components,such as the left and right image displays 180C-D of optical assembly180A-B as described in FIGS. 2C-D (e.g., a display such as a liquidcrystal display (LCD), a plasma display panel (PDP), a light emittingdiode (LED) display, a projector, or a waveguide). The image displays180C-D of the optical assembly 180A-B are driven by the image displaydriver 942. The output components of the eyewear device 100 furtherinclude acoustic components (e.g., speakers), haptic components (e.g., avibratory motor), other signal generators, and so forth. The inputcomponents of the eyewear device 100, the mobile device 990, and serversystem 998, may include alphanumeric input components (e.g., a keyboard,a touch screen configured to receive alphanumeric input, a photo-opticalkeyboard, or other alphanumeric input components), point-based inputcomponents (e.g., a mouse, a touchpad, a trackball, a joystick, a motionsensor, or other pointing instruments), tactile input components (e.g.,a physical button, a touch screen that provides location and force oftouches or touch gestures, or other tactile input components), audioinput components (e.g., a microphone), and the like.

Eyewear device 100 may optionally include additional peripheral deviceelements 919. Such peripheral device elements may include biometricsensors, additional sensors, or display elements integrated with eyeweardevice 100. For example, peripheral device elements 919 may include anyI/O components including output components, motion components, positioncomponents, or any other such elements described herein. The eyeweardevice 100 can take other forms and may incorporate other types offrameworks, for example, a headgear, a headset, or a helmet.

For example, the biometric components of the user interface field ofview adjustment 900 include components to detect expressions (e.g., handexpressions, facial expressions, vocal expressions, body gestures, oreye tracking), measure biosignals (e.g., blood pressure, heart rate,body temperature, perspiration, or brain waves), identify a person(e.g., voice identification, retinal identification, facialidentification, fingerprint identification, or electroencephalogrambased identification), and the like. The motion components includeacceleration sensor components (e.g., accelerometer), gravitation sensorcomponents, rotation sensor components (e.g., gyroscope), and so forth.The position components include location sensor components to generatelocation coordinates (e.g., a Global Positioning System (GPS) receivercomponent), WiFi or Bluetooth™ transceivers to generate positioningsystem coordinates, altitude sensor components (e.g., altimeters orbarometers that detect air pressure from which altitude may be derived),orientation sensor components (e.g., magnetometers), and the like. Suchpositioning system coordinates can also be received over wirelessconnections 925 and 937 from the mobile device 990 via the low-powerwireless circuitry 924 or high-speed wireless circuitry 936.

According to some examples, an “application” or “applications” areprogram(s) that execute functions defined in the programs. Variousprogramming languages can be employed to create one or more of theapplications, structured in a variety of manners, such asobject-oriented programming languages (e.g., Objective-C, Java, or C++)or procedural programming languages (e.g., C or assembly language). In aspecific example, a third party application (e.g., an applicationdeveloped using the ANDROID™ or IOS™ software development kit (SDK) byan entity other than the vendor of the particular platform) may bemobile software running on a mobile operating system such as IOS™,ANDROID™ WINDOWS® Phone, or another mobile operating systems. In thisexample, the third-party application can invoke API calls provided bythe operating system to facilitate functionality described herein.

It will be understood that the terms and expressions used herein havethe ordinary meaning as is accorded to such terms and expressions withrespect to their corresponding respective areas of inquiry and studyexcept where specific meanings have otherwise been set forth herein.Relational terms such as first and second and the like may be usedsolely to distinguish one entity or action from another withoutnecessarily requiring or implying any actual such relationship or orderbetween such entities or actions. The terms “comprises,” “comprising,”“includes,” “including,” or any other variation thereof, are intended tocover a non-exclusive inclusion, such that a process, method, article,or apparatus that comprises or includes a list of elements or steps doesnot include only those elements or steps but may include other elementsor steps not expressly listed or inherent to such process, method,article, or apparatus. An element preceded by “a” or “an” does not,without further constraints, preclude the existence of additionalidentical elements in the process, method, article, or apparatus thatcomprises the element.

Unless otherwise stated, any and all measurements, values, ratings,positions, magnitudes, sizes, and other specifications that are setforth in this specification, including in the claims that follow, areapproximate, not exact. Such amounts are intended to have a reasonablerange that is consistent with the functions to which they relate andwith what is customary in the art to which they pertain. For example,unless expressly stated otherwise, a parameter value or the like mayvary by as much as ±10% from the stated amount.

In addition, in the foregoing Detailed Description, it can be seen thatvarious features are grouped together in various examples for thepurpose of streamlining the disclosure. This method of disclosure is notto be interpreted as reflecting an intention that the claimed examplesrequire more features than are expressly recited in each claim. Rather,as the following claims reflect, the subject matter to be protected liesin less than all features of any single disclosed example. Thus, thefollowing claims are hereby incorporated into the Detailed Description,with each claim standing on its own as a separately claimed subjectmatter.

While the foregoing has described what are considered to be the bestmode and other examples, it is understood that various modifications maybe made therein and that the subject matter disclosed herein may beimplemented in various forms and examples, and that they may be appliedin numerous applications, only some of which have been described herein.It is intended by the following claims to claim any and allmodifications and variations that fall within the true scope of thepresent concepts.

What is claimed is:
 1. Eyewear, comprising: a frame; an optical membersupported by the frame; a temple; a hinge coupled between the frame andthe temple, the hinge configured to allow rotation of the temple withrespect to the frame; an extender configured to allow the temple toextend away from the hinge to a hyperextended position; and anelectrical conductor coupled to the hinge, the electrical conductorhaving a first service loop configured to allow the electrical conductorto extend when the temple extends away from the hinge to thehyperextended position, and a second service loop configured to allowthe electrical conductor to extend when the temple is rotated about thehinge.
 2. The eyewear of claim 1, wherein the first service loop isseparated from the second service loop.
 3. The eyewear of claim 2,wherein the hinge is interposed between the first service loop and thesecond service loop.
 4. The eyewear of claim 3, wherein the electricalconductor is secured to the hinge between the first service loop and thesecond service loop.
 5. The eyewear of claim 1, wherein the extendercomprises an extension member coupled to the hinge, wherein the templeis configured to extend along the extension member when extended to thehyperextended position.
 6. The eyewear of claim 2, further comprising alimit member configured to limit a travel distance of the temple alongthe extension member.
 7. The eyewear of claim 2, wherein the extendercomprises a bushing coupled to the temple, the bushing containing aspring configured to extend about the extension member.
 8. The eyewearof claim 7, wherein the spring is configured to enable the temple toradially extend from the hinge, and also create a bias force to retractthe temple toward the hinge.
 9. The eyewear of claim 7, wherein thespring is configured to compress against the bushing when the bushing isextended from the hinge, and create a bias force configured to retractthe temple toward the hinge.
 10. The eyewear of claim 1, wherein thespring is at least partially within the bushing.
 11. The eyewear ofclaim 1, further comprising a protrusion positioned between the frameand the temple, the protrusion configured to create a cam.
 12. Theeyewear of claim 11, wherein the cam is configured to create a gapbetween the frame and the temple when the temple is hyperextended. 13.The eyewear of claim 1, wherein the electrical conductor comprises aflexible printed circuit (FPC) secured between the first service loopand the second service loop.
 14. Eyewear, comprising: a frame; anoptical member supported by the frame; a temple; a hinge coupled betweenthe frame and the temple, the hinge configured to allow rotation of thetemple with respect to the frame; an extender coupled to the hinge andconfigured to allow the temple to radially extend away from the hinge,and create a bias force configured to selectively retract the templetowards the hinge; and an electrical conductor coupled to the hinge, theelectrical conductor having a first service loop configured to allow theelectrical conductor to extend when the temple extends away from thehinge to the hyperextended position, and a second service loopconfigured to allow the electrical conductor to extend when the templeis rotated about the hinge.
 15. The eyewear of claim 14, wherein thefirst service loop is separated from the second service loop.
 16. Theeyewear of claim 15, wherein the hinge is interposed between the firstservice loop and the second service loop.
 17. The eyewear of claim 16,wherein the electrical conductor comprises a flexible printed circuit(FPC) secured to the hinge between the first service loop and the secondservice loop.
 18. The eyewear of claim 14, wherein the extendercomprises a longitudinally extending member extending away from thehinge.
 19. The eyewear of claim 18, further comprising a bushingslidably coupled to the longitudinally extending member and a springcoupled to the bushing.
 20. The eyewear of claim 19, wherein the springis configured to enable the temple to radially extend from the hinge,and also create a bias force to retract the temple toward the hinge.